The effect of hot bending and thermal ageing on creep and microstructure evolution in thick-walled P92 steel pipe

Sklenička, V.; Kuchařová, K.; Král, Pétr; Kvapilová, Marie; Svobodová, Marie; Čmakal, Josef

doi:10.1016/j.msea.2015.07.072

Cited by 37 publications

(35 citation statements)

References 44 publications

(62 reference statements)

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“…It is generally accepted that creep cavities are nucleated in 9-12%Cr steels at coarse and hard precipitates of the Laves phase along grain boundaries [9,15,38], and are considered to be a cause of low ductility at low stresses or in long-term exposures. Figure 13 shows creep cavities located at the Laves phase particle.…”

Section: Discussionmentioning

confidence: 99%

“…The material of the commercial thick-wall pipe under investigation was W-alloyed 9%Cr P92 steel (ASME Grade 92) produced by Productos Tubulares, s.a.u., Spain [15]. The original dimensions of this pipe were OD 350 mm × WT 39 mm.…”

Section: Materials and Processingmentioning

confidence: 99%

“…The creep in modified P92 steel has been widely *Corresponding author: tel. : +420 532 290 454; e-mail address: sklen@ipm.cz reported [5][6][7][8][9][10][11][12][13][14][15]. Its creep behaviour has been examined in terms of the variation of creep flow with time and strain, stress and temperature dependences of the minimum creep rate, the time to fracture and creep ductility.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Sklenička et al [15] presented an extensive study of creep behaviour and evolution of microstructure of P92 steel with the aim to identify acting creep deformation mechanisms and instability of microstructure. In this study, using the earlier published creep data [15] of uniaxial creep testing in tension, which have been considerably extended, the creep fracture characteristics of P92 steel will be analysed by linking them to the identified creep degradation mechanisms, in terms of empirical formulas for the fracture time assessment [18,19], and by the creep damage tolerance factor λ [20][21][22][23][24][25][26] as an important outcome of the continuum damage mechanics (CDM) approach. The data analysis will be followed by fractographic analyses, which will be used to identify the creep fracture mode(s) experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Applicability of empirical formulas and fractography for assessment of creep life and creep fracture modes of tempered martensitic 9%Cr steel

Sklenička¹,

Kuchařová²,

Král³

et al. 2017

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In this study, the creep behaviour of P92 steel in as-received condition and after longterm isothermal ageing was investigated at 600 and 650 • C using uniaxial tension creep tests. The creep testing was carried out in the power-law creep region. The analyses of creep data indicate that creep behaviour of the steel under investigation obeys both Monkman-Grant and modified Monkman-Grant empirical formulas and provides high values of creep damage factor λ. The tertiary creep was examined in terms of the variations of the time to onset of tertiary creep tot with the time to fracture t f. To assess the effect of damage process on the loss of creep strength, most creep tests were followed by fractographic investigations. It was observed that the large Laves phase particles, which coarsened during creep exposure, served as preferred sites for creep cavity nucleation. The fractography of creep ruptured specimens revealed a dominant transgranular fracture mode by necking at the highest stresses, and a mixture of transgranular and intergranular fracture modes at medium and low-stress regions.

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Section: Discussionmentioning

confidence: 99%

Section: Materials and Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Applicability of empirical formulas and fractography for assessment of creep life and creep fracture modes of tempered martensitic 9%Cr steel

Sklenička¹,

Kuchařová²,

Král³

et al. 2017

Self Cite

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“…The second aim is to determine whether creep strain accumulated by specimens of Alloy 617 at this temperature can be accurately measured in-situ using a novel alternating current potential drop (ACPD) strain sensor ( Prajapati et al, 2012;Madhi and Nagy, 2011c;Davies et al, 2011 ). This is essential as it enables the condition of the component material to be evaluated easily.…”

Section: Introductionmentioning

confidence: 99%

The creep of alloy 617 at 700 °C: Material properties, measurement of strain and comparison between finite element analysis and digital image correlation

Narayanan

Dubey

Davies

et al. 2017

International Journal of Solids and Structures

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a b s t r a c tFuture generations of power plants, such as the Ultra-Super-Critical (USC) power plants, are being designed to be operated at more extreme pressures and temperatures in order to achieve higher efficiency. One candidate material for components is Inconel alloy grade 617, a nickel based superalloy, which is expected to possess better creep resistance in comparison to other types of alloys ( Bhadeshia and Honeycombe, 2011;Evans and Wilshire, 1993 ). At present there is little available data or information about the behaviour of this material at the temperature of interest (700 °C) and hence there is a need to evaluate its properties under these conditions. This paper details experimentation on Alloy 617 to evaluate its uniaxial behaviour under tension and creep at 700 °C, using the results obtained to develop a creep damage model based on power law creep in conjunction with the Cocks-Ashby void growth approach Cocks and Ashby (1982) for creep in a multiaxial stress state. Finite Element (FE) simulations are compared to experimental results obtained by Digital Image Correlation (DIC), which is used in order to validate the effectiveness of a power law creep damage model. Results made using a novel electrical strain sensor using ACPD principles supplement this work to draw comparisons between the response of the sensor and the strain field experienced by the specimen.

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Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel

et al. 2019

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Creep testing is conducted on an advanced martensitic‐ferritic creep‐resistant P92 steel (ASME Grade 92) to evaluate the effects of grain refinement and the predeformation impact after processing by severe plastic deformation (SPD), namely, by high‐pressure torsion and high‐pressure sliding. Constant‐load tensile creep tests are carried out in an argon atmosphere at 600 °C and under an applied stress ranging from 50 to 200 MPa. The results show that under the same creep loading conditions, the ultrafine‐grained (UFG) microstructure states after SPD processing exhibit higher minimum creep rate trueϵ˙m and creep fracture plasticity ϵf, but significantly shorter creep lives in comparison with the coarse‐grained (as‐received) state of the steel. These distinct differences between the coarse‐grained and UFG states are explained by the different deformation mechanisms that operate; creep behavior in a coarse‐grained state is controlled by the intragranular climb of dislocations, while creep in UFG states can be interpreted as the synergistic action of the dynamic recovery of free dislocations at high‐angle grain boundaries and grain boundary‐mediated deformation processes.

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The effect of hot bending and thermal ageing on creep and microstructure evolution in thick-walled P92 steel pipe

Cited by 37 publications

References 44 publications

Applicability of empirical formulas and fractography for assessment of creep life and creep fracture modes of tempered martensitic 9%Cr steel

Applicability of empirical formulas and fractography for assessment of creep life and creep fracture modes of tempered martensitic 9%Cr steel

The creep of alloy 617 at 700 °C: Material properties, measurement of strain and comparison between finite element analysis and digital image correlation

Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel

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